Timothy Joseph Tschida (pronounced /ˈʃidə/; born May 4, 1960 in St. Paul, Minnesota) is an umpire in Major League Baseball. He joined the American League's full-time staff in 1986, and has worked in both major leagues since 2000.
Prior to pursuing professional umpiring, he attended St. Thomas University. His professional umpiring career began after he attended the Joe Brinkman Umpire School in 1981. He was elevated to the AL for the 1986 season. In 2000, the American and National Leagues combined umpiring staffs. He has worn uniform number 4 throughout his career.
He has worked in ten postseasons, including the World Series in 1998, 2002 and 2008; the League Championship Series in 1993, 1999, 2000, and 2001; and the Division Series in 1996, 1997, 1998, 2001, 2002, 2006 and 2007. He worked the All-Star Game in 1992 and 2002. He was the second base umpire for the single-game playoff to decide the NL's 2007 wild card team. He was also the third base umpire for Kenny Rogers' perfect game on July 28, 1994, and the home plate umpire for Nolan Ryan's seventh no-hitter on May 1, 1991 and Carlos Zambrano's no-hitter on September 14, 2008.